Unfortunatelly i understood that there are fake versions of Princo 4X DVD-R.
Original Ones have this serial on them : PB17U4013693-14946 - the last 5 digits change according to each DVD-R.
Fake Princo’s : M140324092-05866 - last digits change for every DVD-R.
Be careful.Fake Princo’s will be clearly noticed in K-Probe such as getting
PI=50 PIF=4 whereas original ones should get : PI=2-3 PIF=0.1
if you have come across to such fake media’a please let us know.